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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 02, 2022 | Nov. 30, 2021 | Dec. 31, 2019 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2019 | Feb. 28, 2022 | Feb. 01, 2021 | Dec. 31, 2018
Stockholders Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  | 1,000,000,000.0 |  |  |  | 1,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  |  |  |  | $ 0.10 |  |  |  | $ 0.10 |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  |  |  |  | 4,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  |  |  | $ 1.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends rate per share |  |  |  |  | $ 0.84 | $ 0.49 | $ 0.34 | $ 0.30 | 0.37 | $ 0.11 | $ 0.11 | $ 0.09 | $ 0.09 | $ 0.09 | $ 0.09 | $ 0.08 |  |  |  |
Fixed Dividend [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend payable amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 106 |
Fixed Dividend [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends rate per share |  |  |  |  |  |  |  |  |  |  |  | $ 0.09 |  |  |  | $ 0.08 |  |  |  |
Fixed Dividend [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends rate per share |  |  |  |  |  |  |  |  |  |  | $ 0.11 |  |  |  | $ 0.09 |  |  |  |  |
Special Dividend Paid [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends rate per share |  |  |  |  |  |  |  |  | $ 0.26 |  |  |  |  |  |  |  |  |  |  |
Dividend payable amount |  |  |  |  |  |  |  |  | $ 97 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend payable, year | 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, per share | $ 1.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Fixed Dividend [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of increase to quarterly dividend |  |  |  | 45.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends rate per share | $ 0.16 |  |  | $ 0.16 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Variable Dividend [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend payable amount | $ 557 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, per share | $ 0.84 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Repurchase Program [Member] | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,600 |  |
5.0 Billion Dollar Share Repurchase Program Closed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000
Share-repurchase program expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2019 |  |  |
1.0 Billion Dollar Share Repurchase Program Closed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-repurchase program, authorized amount |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  | $ 1,000 |  |  |
Share-repurchase program expiration date |  |  | Dec. 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
1.0 Billion Dollar Share Repurchase Program Open [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-repurchase program, authorized amount |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-repurchase program expiration date |  | Dec. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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